`LiveFitPlot` - set title to parameters of fit

As a user I would like the actual parameters of the fit to be in the plot title of a `LiveFitPlot`.

This might not need to be all of the parameters of the fit - for example, on a `Gaussian` fit, only the `x0` parameter might be relevant enough to put in the plot title. Or `cen` on an `Erf`, etc.

We might need the fits themselves to be able to "hint" a plot title, that way they can return a string most suitable for that kind of fit (and this can be overridden if necessary).

We also need to be able to turn this off for when there are e.g. many fits in the same plot.

### Notes

### Acceptence Criteria
- [ ] Paremeters of fit appear in the plot title.
- [ ] Option to enable/disable this

- How does this work for multiple fits on the same plot?

Discussed 00:19:40 - in planning 02/10/25